provide Isabelle/Scala environment as Java extension, instead of user classpath
(which is subject to adhoc changes);

--- a/Admin/build	Thu Jun 23 14:52:32 2011 +0200
+++ b/Admin/build	Thu Jun 23 16:10:22 2011 +0200
@@ -84,6 +84,7 @@
 
 function build_jars ()
 {
+  "$ISABELLE_HOME/lib/scripts/java_ext_dirs" >/dev/null
   pushd "$ISABELLE_HOME/src/Pure" >/dev/null
   "$ISABELLE_TOOL" env ./build-jars "$@" || exit $?
   popd >/dev/null

--- a/Isabelle	Thu Jun 23 14:52:32 2011 +0200
+++ b/Isabelle	Thu Jun 23 16:10:22 2011 +0200
@@ -26,4 +26,4 @@
 CLASSPATH="$(jvmpath "$CLASSPATH")"
 exec "$ISABELLE_TOOL" java \
   "-Disabelle.home=$(jvmpath "$ISABELLE_HOME")" \
-  -jar "$(jvmpath "$ISABELLE_HOME/lib/classes/isabelle-scala.jar")" "$@"
+  isabelle.GUI_Setup "$@"

--- a/etc/settings	Thu Jun 23 14:52:32 2011 +0200
+++ b/etc/settings	Thu Jun 23 16:10:22 2011 +0200
@@ -62,8 +62,6 @@
   ISABELLE_JAVA="java"
 fi
 
-classpath "$ISABELLE_HOME/lib/classes/Pure.jar"
-
 
 ###
 ### Interactive sessions (cf. isabelle tty)

--- a/lib/Tools/java	Thu Jun 23 14:52:32 2011 +0200
+++ b/lib/Tools/java	Thu Jun 23 16:10:22 2011 +0200
@@ -7,10 +7,13 @@
 CLASSPATH="$(jvmpath "$CLASSPATH")"
 
 JAVA_EXE="${THIS_JAVA:-$ISABELLE_JAVA}"
-if "$JAVA_EXE" -server >/dev/null 2>/dev/null
-then
-  exec "$JAVA_EXE" -Dfile.encoding=UTF-8 -server "$@"
+
+if "$JAVA_EXE" -server >/dev/null 2>/dev/null; then
+  SERVER="-server"
 else
-  exec "$JAVA_EXE" -Dfile.encoding=UTF-8 "$@"
+  SERVER=""
 fi
 
+exec "$JAVA_EXE" -Dfile.encoding=UTF-8 $SERVER \
+  "-Djava.ext.dirs=$("$ISABELLE_HOME/lib/scripts/java_ext_dirs")" "$@"
+

--- a/lib/Tools/scala	Thu Jun 23 14:52:32 2011 +0200
+++ b/lib/Tools/scala	Thu Jun 23 16:10:22 2011 +0200
@@ -9,4 +9,5 @@
 [ -e "$ISABELLE_HOME/Admin/build" ] && { "$ISABELLE_HOME/Admin/build" jars || exit $?; }
 
 CLASSPATH="$(jvmpath "$CLASSPATH")"
-exec "$SCALA_HOME/bin/scala" -Dfile.encoding=UTF-8 "$@"
+exec "$SCALA_HOME/bin/scala" -Dfile.encoding=UTF-8 \
+  "-Djava.ext.dirs=$("$ISABELLE_HOME/lib/scripts/java_ext_dirs")" "$@"

--- a/lib/scripts/java_ext_dirs	Thu Jun 23 14:52:32 2011 +0200
+++ b/lib/scripts/java_ext_dirs	Thu Jun 23 16:10:22 2011 +0200
@@ -36,5 +36,6 @@
 ## main
 
 JAVA_EXE="${THIS_JAVA:-$ISABELLE_JAVA}"
-exec "$JAVA_EXE" -classpath "$(jvmpath "$TARGET")" isabelle.Java_Ext_Dirs "$@"
+exec "$JAVA_EXE" -classpath "$(jvmpath "$TARGET")" isabelle.Java_Ext_Dirs \
+  "$(jvmpath "$ISABELLE_HOME/lib/classes/ext")"
 

--- a/src/Pure/build-jars	Thu Jun 23 14:52:32 2011 +0200
+++ b/src/Pure/build-jars	Thu Jun 23 16:10:22 2011 +0200
@@ -180,6 +180,9 @@
   jar ufe "$(jvmpath "$FULL_JAR")" isabelle.GUI_Setup isabelle scala || \
     fail "Failed to produce $FULL_JAR"
 
+  mkdir -p "$TARGET_DIR/ext"
+  cp "$FULL_JAR" "$TARGET_DIR/ext/"
+
   popd >/dev/null
 
   rm -rf classes

--- a/src/Tools/jEdit/lib/Tools/jedit	Thu Jun 23 14:52:32 2011 +0200
+++ b/src/Tools/jEdit/lib/Tools/jedit	Thu Jun 23 16:10:22 2011 +0200
@@ -234,14 +234,13 @@
       print qq,<MODE NAME="scala" FILE="scala.xml" FILE_NAME_GLOB="*.scala" />\n\n,; }
     print; }' dist/modes/catalog
 
-  cp -a "${JEDIT_JARS[@]}" "${SCALA_JARS[@]}" "$PURE_JAR" dist/jars/. || failed
+  cp -a "${JEDIT_JARS[@]}" "$SCALA_HOME/lib/scala-compiler.jar" dist/jars/. || failed
   (
-    for JAR in "$JEDIT_JAR" "${JEDIT_JARS[@]}" "$SCALA_HOME/lib/scala-compiler.jar"
+    for JAR in "$JEDIT_JAR" "${JEDIT_JARS[@]}" "$PURE_JAR" "$SCALA_HOME/lib/scala-compiler.jar"
     do
       CLASSPATH="$CLASSPATH:$JAR"
     done
     CLASSPATH="$(jvmpath "$CLASSPATH")"
-
     exec "$SCALA_HOME/bin/scalac" -unchecked -deprecation \
       -d dist/classes -target:jvm-1.5 "${SOURCES[@]}"
   ) || fail "Failed to compile sources"